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To be a bit more specific: when should you call Atlanta Landscape and Fertilization for core aeration?
The answer to that question depends on what type of grass you have; cool season grass or warm season grass.
Cool season grass like bluegrass (and you thought it was just a type of music with banjos) is best to aerate in the fall, at least 4 weeks before the first hard freeze, or in the spring.
If you have a warm season variety like Bermuda grass the best time for core aeration is mid spring to early summer to avoid the high and dry temperatures that are also associated with Bermuda shirts.